Yocto- Definition
yäktō, yäktə
prefix
One septillionth (10−24 ).
Yoctosecond.
American Heritage
affix
One septillionth part of; the factor 10-24
Yoctosecond.
Webster's New World
Origin of Yocto-
Alteration of octo– (from its representing the eighth power of a thousandth)
From American Heritage Dictionary of the English Language, 5th Edition
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